Hammer for impact pulverizers



June 26, 1951 F. E. SMITH 2,558,107

HAMMER FOR IMPACT PULVERIZERS Filed Feb. 15, 1946 2 Sheets-Sheet 1 v June 26, 1951 Filed Feb. 15, 1946 F. E. SMITH 2,558,107

HAMMER FOR IMPACT PULVERIZERS 2 Sheets-Sheet 2 iii ZZZ Z le J.

Patented June 26, 1951 HAMMER FOR IIHPACT PULVERIZERS Forrest E. smith, Ashcville, N. o. 1 Application February 15, 1946, Serial No. 647,668

13 Claims. (Cl. 241-194) The present invention relates generally to improvements in rotary impact 'pulverizers, and has particular reference to new and improved attachment means for mounting and securing renewable tips to the revoluble hammers employed therein.

One of the objects of the present invention is to provide a novel locking device for the renewable tips of impact hammers which is not dependent on the use of nuts, bolts, cotter pins, or other exposed fastening members normally employed, and subject to work loose or fail because of wear, but which is maintained positively in assembled relation and protected against wear and breakage.

Another object is to provide a new and improved locking device of the foregoing character which cannot become loose or disengaged without disassembling the pulverizer or while the pulverizer is in operation.

A further object is to provide a, novel locking device which permits the use of comparatively small hammer tips so as to reduce their cost and. consequently, justify frequent replacements thereof after moderate wear in the interest of obtaining maximum operating eificiency.

Other objects and advantages will become apparent as the description proceeds.

In the accompanying drawings,

Figure 1 is a transverse vertical sectional view of a pulverizer provided with impact hammers embodying the features of my invention.

Fig. 2 is a perspective view on an enlarged scale of one of the hammers, with the impact tip removed.

Fig. 2a is a rear elevational view of replaceable tips in assembled relation.

Fig. 3 is a sectional view of the hammer, taken substantially along line 3-3 of Fig. 2, but with the renewable tip secured in position.

Fig. 4 is. a longitudinal sectional view of a modified form of hammer, taken substantially along line 4-4 of Fig. 5.

Fig. 5 is a fragmentary sectional view taken substantially along line 55 of Fig. 4.

Fig. 6 is a longitudinal sectional view of another form of hammer, taken substantially along line 6-6 of Fig. 7.

Fig. '7 is a fragmentary side elevational view of the hammer shown in Fig. 6.

Referring more particularly to the drawings, attachment means embodying the present invention are adapted for use with various types of renewable hammer tips in diflerent kinds and types of rotary crushers, mills or Dulverizers.

for example as nuts and bolts.

2 For purposes of illustration, one exemplary form of hammer is shown in connection with a rotary pulverizer (see Fig. 1) of conventional design. Briefly described, the pulverizer comprises 2. casing l 0 which is mounted on a base I I, and which has a feed inlet I2 at one side for the material. such as stone, to be crushed or pulverized. Mounted in the casing III is a drive shaft, adapted to be connected to a suitable source of power (not shown). Hammer suspension means is mounted on the shaft I3, and in the present instance comprises a plurality of axially spaced disks l4 (one shown) secured in fixed relation to the shaft for rotation therewith. A plurality of hammers l5, four in the present instance, are

secured in uniformly peripherally spaced relation to the disks l4 and project radially therefrom. The casing l 0 is provided in the top portion with an inner lining plate I6 and in the bottom portion with a grate structure l1, conforming generally to the circle of revolution of the outer ends of the hammers l5.

It will be understood that in use the hammers l5 are revolved at very high speeds. Hence they are subjected to heavy centrifugal force and also to severe impact in reducing the material to be pulverized. Wear occurs at the outer leading edges of the hammer tips, and necessitates frequent replacement of the hammers.

The primary feature of the present invention resides in the provision of new and improved means for removably mounting and positively locking renewable impact tips on the hammers. Heretofore, such tips have been secured in position by various kinds of attachment means, such In these instances. the nuts tend to work loose and the heads of the bolts are subject to considerable wear. The present attachment means, although adapted to be provided in various forms depending on the specific type or construction of the hammers, is protected against wear, and is positively locked in assembly so that it cannot fail or become loose. More particularly, the attachment means of the present invention, in its broad aspects, comprises a first disengageable interlocking connection between the hammer arm and the tip for mounting the tip in operative position, and a second disengageable interlocking connection acting to constrain the first connection against disengagement and .being positively maintained when the pulverizer is fully assembled. As stated, the attachment means may be varied in form for different kinds and types of hammers and hammer tips, and is guano? especially adapted, although not limited in use, for tips of the reversible type as disclosed in my copending application Serial No. 533,851, filed May 3, 1944 (Patent No. 2,467,865, issued April 19, 19 :9.)

In the form of Figs. 1 to 3, each hammer ll comprises two spaced parallel flat-sided hammer arms I! which are pivotally connected at one end to the disks II for swinging movement. More particularly, the inner ends of the arms I! are formed with bearing openings |8 adapted to receive a supporting pivot shaft 9 anchored to the disks H and extending through the intervening space in parallel relation to the drive shaft 13. It will be understood that the pivoted ends of the arms l9 extend in overlapping relation with the disks H and are constrained by the latter against axial movement along the .pivot shaft 9. The outer ends of the arms IE are integrally or rigidly connected by a cross head 20 to which a renewable tip 2| is adapted to be secured. In operation, centrifugal force will cause the hammers i normally to occupy a generally radial position with reference to the axis of revolution.

The renewable tip 2| may be connected to any desired portion of the head 20, and preferably is attached to the leading face thereof, and is of the reversible type. In the present instance, the tip 2| has a leading face 22 provided with radially spaced inner and outer marginal edges 23 and 24, defining impact edges, which extend transversely of the path of revolution, and which are adapted to be located singly in active position by selective reversal of the tip on the head 20.

A suitable disengageable interlocking connection is provided for mounting th tip 2| on the head 20. Preferably, this connection is engageable and disengageable by relative sliding movement of the parts in a direction generally parallel to the axis of revolution so as to withstand the heavy centrifugal force to which the tip 2| is subjected in operation. In instances where the leading face of the supporting head 20 is of substantial length, as in the present form of hammer l5, it is desirable to divide the tip 2| into two sections of like construction adapted to be supported in end-to-end relation. In the preferred form, the mounting connection comprises a T-shaped medial rib 25 extending longitudinally along the front or leading face of the head 20, and a T-slot 29 of complemental shape formed in the rear or trailing face of each tip section 2| and adapted to slidably interfit with either end of the rib. Preferably, the T-slot 26 in each tip section 2| is slightly tapered from end to end, and the opposite end portions of the rib 25 are similarly but oppositely tapered respectively from the midpoint to the opposite ends. As a result, the tip sections 2| may be detachably mounted on opposite ends of the rib 25 to position either one of the impact edges 23 or 24 reversibly in the outermost or active position. By reason of the tapered form of the rib 25 and slots 29, a close wedge fit is obtained. The rib 25, coacting with the slots 26, serves to provide an interlocking connection for mounting the tip 2| securely on the head 20, and for permitting engagement and disengagement only by relative sliding movement in a direction longitudinally of the axis of revolution.

A second interlocking connection is provided for maintaining each of the tip sections 2 on the rib 25 in assembled relation with the head 20.

comprises a key member 21 slidably disposed in a longitudinal groove 29 in the inner side of the associated hammer arm i8. The groove 29 extends at on end to the bearing opening 19 in the arm l8, and at the other end to the leadin face of the head 20 adjacent the neck portion of the rib 25. Slots or keyways 29 are formed near the outer ends of the trailing edge portions of each tip section 2|, and extend transversely of the slot 26. These keyways 29 are so located that when a tip section 2| is assembled on the rib 25, the radially innermost key way will register with a groove 28.

In assembly, the two tip sections 2| are secured to the head 2|) before the hammer I5 is attached to the disks l4. Thus, the two keys 21 are retracted partially into the bearing openings l9 to permit the tip sections 21 to be slidably positioned on opposite end portions of the rib 25. Since the tip sections 2| are alike in construction, they may .be interchanged end for end on the rib 25 so as to locate either of th edges 23 and 24 selectively in outermost position. After the two tip sections 2| are properly located on the rib, the two keys 21 are projected outwardly into engagement in the two keyways 29. Each key 21 is substantially coextensive in length with the associated groove 28 so that when the hammer I5 is mounted on the pivot shaft 9, the latter engage the inner end portion of the key and serves to lock the key against release. The forward edge of the outermost end of the key 21 is exposed to the exterior of the arm l8, and is formed with a notch 30 for the insertion of a tool (not shown) to facilitate disengagement of the key when the hammer is removed from the pivot shaft 9. It will thus be seen that the tip sections 2| are positively locked in position on the head 20 and cannot be removed while the pulverizer is in operation and, in fact, without first removing the hammer i5 from the associated pivot shaft 9.

It will be apparent to one skilled in the art that the keys 21 are maintained in the grooves 28 by disks I4 which preferably lie flatly thereagainst.

In the modified form shown in Figs. 4 and 5, each hammer It: comprises a single flat-sided arm l8 having a bearing opening l9 in one end and an enlarged cross head 2|) on the other end. In this instance, the inner end of the hammer arm |8 is adapted to be confined between two of the disks II in fixed axial position on a pivot shaft 9 extending through the opening Hi. In this instance, the head 20 is adapted to support two selectively interchangeable and reversible hammer tips 2N, and accordingly is formed on both the leading and trailing sides or faces with transverse T-shaped ribs 25 extending generally parallel to the axis of the shaft 9. The hammer tips 2| are alike in construction, and each comprises an outer face 22 with transverse marginal edges 23 and 24 defining impact edges, and an inner face formed with a T-slot 26 parallel to the edges, and with alined slots or keyways 29* extending transversely of the T-slot. Preferably, the ribs 25 on opposite sides of the head 20 are equally but oppositely single tapered from end to end, and the T-slots 26 are complementary in form. As a result, either of the renewable tips 2| may be slidably mounted with a close wedge fit on either of the ribs 25. Due to the reverse taper on the opposed ribs 25 the impact edges 23* and 24* will be reversed upon shifting either tip 2| from one rib to the other. By revers n the hammer arm i8 on the shaft 9, either tip In the present instance, each such connection 7 2|may be disposedinforward or leading position so that by selective interchange of the tips and reversal of the hammer all four edges may be selectively located singly in the active or working position. In the present instance, a single locking element, such as 'a key 21, is provided for securing both tips 2| simultaneously in position on the respective ribs 25*. This key consists of a flatsided bar extending through a slot 3| opening through the hammer arm l8- transversely of the ribs 25 and substantially midway of the ends thereof. When the tips 2| are in position, the key 21 is adapted to engage at opposite ends in the innermost keyways 29' of the oppositely disposed tips 2|. The slot Si is of suiliciently greater width radially of the arm II, as indicated by the reference letter H, than the engaging end portions of the key 21', as indicated by the reference letter h, to permit the latter to be lifted radially inward to bring the ends of the key out of engagement with the keyways 2! whenthe tips are to be removed or replaced.

The key 21 is adapted to be confined in engagement with the tips II by a lockin p n 32 which extends removably through a longitudinal bore 33 opening from the bearing opening I! centrally through the arm ll and head 20. The pin 32 is disposed to engage the inner surface of the key 21', and is of such length that it is blocked against release by the pivot shaft 9 when the hammer arm II is assembled with the latter. The outer end of the bore 33 permitsinsertion of a tool (not shown) to facilitate release of the key 21' when permitted by the pin 32, as for example when the hammer arm lil' is removed from the shaft 9 The third formdisclosed in Figs. 6 and 7 is generally similar to the form of Figs. 1 to 3 in that the hammer comprises two spaced parallel flat-sided arms 18 formed with alined bearing openings l9 to slidably receive the pivot shaft 9. The arms l8 are connected at their outer ends by a cross head 20* formed on the leading face with a T-shaped rib 25' extending parallel to the axis of the shaft 9'. In this instance, the arms are closely spaced so'that the head 20 is comparatively narrow and adapted to support a single renewable tip 2| The tip has a leading face 22 with transverse marginal edges 23 and 24 defining impact edges, and is formed in the rear or trailing face with a T-slot 25 parallel to the edges and with alined keyways 29 at opposite sides of and perpendicular to the T-slot. In the present instance, the rib 25 and the interfitting T-slot 26 are not tapered, but are straight in form so that the tip li may be reversibly assembled on the hammer to present either of the edges 23' and 24 selectively in the outermost or active position.

A key 21 is slidably disposed between the arms l8 and in a slot 34 in the front of the head 20' for releasable engagement at its outer end in the central keyway 29 to secure the tip 21 in longitudinal position of assembly on the rib 25 The key 21' is formed at the inner end with an abutment surface 35 adapted for engagement with the pivot shaft 9 when the hammer i is mounted thereon to confine the key in interlocking engagement with-the tip li It will be evident that I have provided a new and improved renewable tip hammer in which the tip is held positively against removal from the arm when the pulverizer is in assembled condition, and in which the means for securing the tip in position cannot work loose and is not exposed to wear through abrasive contact with the material being crushed. The construction permits the use of smaller tips than have heretofore been employed so as to reduce the cost of renewals. As a result, renewals may be made economically after only moderate wear and before the impact edges are rounded or worn away to an extent that would substantially impair the operating efllciency. In this respect, the impact edges of the hammer tips are most effective and efllcient when in a relatively sharp or square condition, and as these edges become progressively more worn or rounded, they produce increasingly coarser material and suifer a decreasing productive output. The small tips of the present invention can be renewed at low cost as soon as the edges are.rounded off to a radius of one inch or less, thus resulting in the production of a finely-divided product at a comparatively high tonnage per hour. The construction is, therefore, especially suited for fine grinding, as for example in the production of agricultural limestone.

I claim as my invention:

1. A rotary pulverizer comprising, in combination, a drive shaft, a plurality of disks secured to said drive shaft in axially spaced relation, and a plurality of uniformly peripherally spaced hammers pivotally secured to said disks, each hammer comprising a pair of spaced parallel arms integrally connected at their outer ends by a cross head and formed with alined bearing openings adjacent their irmer ends, a pivot shaft extending through said openings for connecting said inner ends of said arms for swinging movement to said disks, a transverse T-rib formed on the leading face of said head and being uniformly tapered toward opposite ends, two hammer tips having T-slots siidably receiving opposite ends of said rib with a wedge lit and disposed substantially in end-to-end relation on said rib, each of said tips being formed with radially spaced inner and outer impact edges and being interchangeable to present said edges reversibly in outermost position, and being formed at opposite sides of the associated slot with transverse keyways', saidarms being formed in their inner side faces with inclined grooves extending from said rib to said openings, key bars siidably disposed in said grooves and engaging at their outer ends in said keyways, said pivot. shaft being disposed across the inner ends of said bars to confine said bars in interlocking key engagement with said tips whereby to maintain said tips on said rib, and means overlying the portions of said grooves adjacent said openings for restraining sidewise movement of said key bars.

2. A rotary pulverizer comprising, in combination, a drive shaft, a plurality of disks secured to said drive shaft in axially spaced relation, and a plurality of uniformly peripherally spaced hammers pivotally secured to said disks, each hammer comprising a pair of spaced parallel arms integrally connected at their outer ends by a cross head and formed with alined bearing openings adjacent their inner ends, a pivot shaft extending through said openings for connecting said irmer ends of said arms for swinging movement to said disks, a transverse T-rib formed on the leading face of said head, two hammer tips having T-slots siidably receiving opposite ends of said rib and disposed substantially in end-to-end relation, each of said tips being formed with radially inner and outer impact edges and being interchangeable to present said edges reversibly in outermost position, and being formed at opposite sides of the associated slot with transverse keyways, said arms being formed in their inner side faces with grooves opening from said rib to said openings, key members slidably disposed in said grooves and engaging at their outer ends in said keyways, and means at least partially enclosing said grooves to prevent sidewise displacement of said key bars, said pivot shaft being disposed across the inner ends of said members to confine said members in interlocking key engagement with said tips whereby to maintain said tips on said rib. I

3. A rotary pulverizer comprising, in combination, a drive shaft, a suspension means secured to said drive shaft, and a plurality of uniformly peripherally spaced hammers pivotally secured to said means, each hammer comprising a pair of spaced parallel arms integrally connected at their outer ends by a cross head and formed with alined bearing openings adjacent their inner ends, a pivot shaft extending through said openings for connecting said inner ends of said arms for swinging movement to said means, a transverse T-rib formed on the leading face of said head, two hammer tips having T-slots slidably receiving opposite ends of said rib and disposed substantially in end-to-end relation, each of said tips being formed with impact edges and at opposite sides of the associated T-slot with transverse keyways, and key bars slidably supported on said arms for movement transversely of said shaft and engaging at their outer ends in said keyways, said pivot shaft being disposed across the inner ends of said bars to confine said bars in interlocking key engagement with said tips whereby to maintain said tips on said rib. v

4. A rotary pulverizer comprising, in combination, a drive shaft, a suspension means secured to said drive shaft, and a plurality of uniformly peripherally spaced hammers pivotally secured to said means, each hammer comprising a pair of spaced parallel arms integrally connected at their outer ends by a cross head and formed with alined bearing openings adjacent their inner ends, a pivot shaft extending through said openings for .connecting said inner ends of said arms for swinging movement to said means, a T-rib formed on said head and extending parallel to said shaft,

a plurality of hammer tips each having a T-slot slidably engaging said rib and disposed on said rib in end-to-end relation, and individual keys slidably supported on said hammer for movement transversely of said rib into and out of interlocking engagement respectively with said tips, said shaft when in position serving to block said keys against disengagement from said tips.

5. A rotary pulverizer comprising, in combination, a drive shaft, 2. suspension means secured to said drive shaft, and a plurality of uniformly peripherally spaced hammers pivotally secured to said means, each hammer comprising a pair of spaced parallel arms integrally connected at their outer ends by a cross head and formed with alined bearing openings adjacent their inner ends, a pivot shaft extending through said openings for connecting said inner ends of said arms for swinging movement to said means, a plurality of hammer tips normally disposed in end-to-end relation on said head, disengageable interlocking connections between said head and said tips and being separable by relative sliding movement of said tips on said head longitudinally of said shaft, and keys slidably supported on said hammer transversely of said shaft for interlocking engagement with said tips to prevent separation of said connections, said keys being confined in engagement with said tips when said hammer arms are assembled with said shaft. I

6. A rotary pulverizer comprising, in .combination, a drive shaft, a plurality of disks secured to said drive shaft in axially spaced relation, and a plurality of uniformly peripherally spaced hammers pivotally secured to said disks. each hammer comprising a generally radial arm formed with a shaft receiving opening at one end and a longitudinal bore extending from said opening to the other end, a pivot shaft removably extended through said opening to connect said arm pivotally to said disks, said other end having a head formed at opposite sides with transverse T-ribs tapered from end to end equally but respectively in opposite directions, two hammer tips having tapered T-slots slidably receiving said ribs and having transverse keyways at opposite sides of said slots, the outer faces of said tips having radially spaced inner and outer impact edges, said tips being interchangeable on said ribs in reversed end for end position whereby to present said edges selectively in outermost position, said arm being reversible on said shaft, a transverse slot opening through said arm in registration with said keyways, a key disposed in said transverse slot in interlocking engagement at opposite ends in the innermost ones of said keyways, and a locking pin extending inwardly from said key through said bore to said opening and confined in end engagement against said key by said shaft.

7. A rotary pulverizer comprising, in combination, a drive shaft, suspension means secured to said drive shafts in axially spaced relation, and a plurality of uniformly peripherally spaced hammers pivotally secured to said means, each hammer comprising a generally radial arm formed with a shaft receiving opening at one end and a longitudinal bore extending from said opening to the other end, a pivot shaft removably extended through said opening to reversibly connect said arm pivotally to said means, said other end having a transverse head, two hammer tips removably and interchangeably mounted on opposite sides of said head, disengageable interlocking connections between said heads and said tips and being separable by relative sliding movement of said tips on said head longitudinally of said shaft, a slot opening through said arm transversely of said shaft, a key disposed in said transverse slot in separable interlocking engagement at opposite ends with said tips, and a locking element extending through said bore and confined therein by said shaft to block said key against disengagement from said tips.

8. A rotary pulverizer comprising, in combination, a drive shaft, a plurality of disks secured to said drive shaft in axially spaced relation, and a plurality of uniformly peripherally spaced hammers pivotally secured to said disks, each hammer comprising a pair of spaced parallel arms integrally connectet at their outer ends by a cross head and formed with alined bearing openings adjacent their inner ends, a pivot shaft extending through said openings for connecting said inner ends of said arms for swinging movement to said disks, a transverse T-rib formed on the leading side face of said head, a hammer tip having a transverse T-slot in one face slidably receiving said rib and formed with spaced inner and outer transverse impact edges and being reversible end for end on said rib to present either of said edges selectively in outermost position and being formed at opposite sides of said lot with transverse keyways, and a key disposed between said arms for movement transversely of said rib to project one end into interlocking engagement with the innermost of said keyways, the other end of said key being blocked by said shaft to constrain said key against disengagement from said tip.

9. A rotary pulverizer comprising, in combination, a drive shaft, suspension means on said drive shaft, and a plurality of uniformly peripherally spaced hammers pivotally secured to said means, each hammer comprising an arm having a bearing opening at the innermost end and a head at the outermost end formed on one side with an undercut rib extending generally parallel to the axis of said shaft, a pivot shaft extending removably through saidopening forconnecting said innermost end pivotally to said means, a renewable tip having an impact face and an opposed face formed with an undercut slot slidably receiving said rib, said tip being formed with a keyway opening laterally of said slot, and a key confined on said arm for movement longitudinally relative to the latter and engageable in said keyway to restrain said tip on said head, said key having means longitudinally slidable relative to said arm and engageable by said pivot shaft after assembly of the latter for locking said key in said keyway.

10. In an impact hammer for rotary pulverizers, in combination,.an elongated hammer arm adapted to be pivotally connected at one end by a pivot shaft to a rotary support for bodily revolution about a fixed axis, and having a head at the other end, a hammer tip having a trailing side face and having a leading side impact face formed with an outer transverse impact edge, a slidably disengageable connection between said head and said trailing face of said tip interlocking said head and tip against separation longitudinally of said arm, and releasable means providing a second connection between said arm and said tip interlocking said head and tip against separation laterally of said arm to constrain said first connection against disengagement, and means engageable with said pivot shaft for maintaining said second interlocking connection in the locked condition as a result of pivotal assembly of said arm with the support.

11. In an impact hammer for rotary pulverizers, in combination, an elongated hammer arm having a bearing opening in one end to receive a pivot shaft for connecting said arm to a rotary support for bodily revolution about a fixed axis, and having a head at the other end, a hammer tip having a leading side face formed with an outer transverse impact edge and a trailing side face, a disengageable interlocking connection between said arm and the trailing face of said tip and being separable by relative sliding movement laterally of said arm. and means including a second disengageable interlocking connection between said arm and said tip and being separable by relative sliding movement longitudinally of said arm, said last mentioned connection having a longitudinally slidable portion extending to said bearing opening for engagement with said shaft for locking said last mentioned connection against separation as an incident to pivotal as sembly of said arm with said shaft.

12. In an impact hammer for rotary pulverizers, in combination, an arm having a bearing opening at one end and adapted to removably receive a supporting shaft and having a head at the other end formed on one side with a transverse T-rib extending parallel to the axis of said opening, a renewable tip having an impact face and an opposed face formed with a transverse T- slot slidably receiving said rib, said tip being formed with a keyway extending laterally of said slot, and key means supported on said arm for sliding movement toward and away. from said opening and removably engageable in said keyway in the outer position of said key means to retain said tip on said head, said key means extending inwardly to the bearing opening for engagement with said supporting shaft to retainsaid key means in the outer locking position when said shaft is inserted through said opening.

13. In an impact hammer for rotary pulverizers, in combination, an arm having a bearing opening at one end and adapted to receive a supporting shaft and having a head at the other end formed on one side with a mounting face, a renewable tip having, an impact face and an opposed mounting face, one of said mounting faces being formed with an undercut rib and the other being formed with a complemental undercut slot for relative sliding engagement in a direction parallel to the axis of said opening, said tip being formed with a keyway extending laterally of said slot, and means including a key on said arm for sliding movement longitudinally of said arm and removably engageable in said keyway to retain said tip on said read, said key means having a portion slidable longitudinally of said arm and engageable with said shaft for locking said key in engagement with said keyway.

FORREST E. SMITH.

REFERENCES CITED The following references are of record in the file of this patent: 1

UNITED STATES PATENTS Number Name Date 1,212,991 Newhouse Jan. 16, 1917 1,331,968 Tomlinson Feb. 24, 1920 1,630,021 Lucas May 24, 1927 2,152,332 Smith Mar. 28, 1939 2,318,219 Harris May 4, 1943 2,460,279 Ehmann Dec. 10, 1943 FOREIGN PATENTS Number Country Date 498,415 Great Britain Jan. 10, 1939 95,728 Sweden Mar. 16, 1939 

